Lighting device for incandescent gas-burners.



PATENTED' MAY 19, 1903.

2 sums-sum 1.

J. & G. KEITH. LIGHTING DEVICE FOR INOANDESGENT GAS BURNERS.

APPLICATION FILED AUG. 19. 1902.

no HODEL.

" No. 728,242. PATENTED MAY19\,1'908.

' J. &. G. KEITH.

LIGHTING DEVICE FOR INOANDESGENTGAS'BURNERS.

APPLICATION FI LED AUGi 19. 1902.

N0 MODEL. 2 SHEETS-SHEET 2.

UNITED STATES Patented May 19, 1903.

PATENT 'OFFICEO JAMES KEITH AND GEORGE KEITH, OF LONDON, ENGLAND LIGHTING DEVICE FOR INCANDESCENT GAS-BURNERS.

SPECIFICATION forming part of Letters Patent No. 728,242, dated May 19, 1903.

Application filed August 19, 1902. Serial No.120,257. .(No model.)

To all whom it may concern:

Be it known that we, JAMES KEITH an GEORGE KEITH, subjects of the King of the United Kingdom of Great Britain and Ireland, residing at 27 Farringdon avenue, London, England, have invented certain new and useful Improvements in Lighting Devices for Incandescent GasBurners, (for which application forpatent has been made in GreatBritain, No. 11,644, dated May 22, 1902,) of which the following is a specification.

This invention relates to devices for lighting incandescent gas-burners by means of an electric spark through the intervention of a by-pass pilot-light; and it has for its object to so construct and arrange the tap by-pass and relative devices that the by-passis an tomatically cut 01f on the burner being lighted, so that a saving of gas is effected, and risk of fire due to the pilot-light being left burning is avoided.

In the accompanying drawings, which illusirate the invention, Figure 1 is an elevation, Fig. 2 is a sectional elevation,- and Fig.3 a plan, of the device when the burner is full on. 'Figs. 4: and. 5 are elevation and sectional elevation, respectively, of the device when the burner and by-pass are both on, and Figs. 6 and 7 are elevation and sectional elevation when burner and by-pass are both As shown in the drawings, the burner-base is furnished with a plug-tap b, operated by a cross-lever c, to which a chain'or other handpull d may be attached, the tap I) having an orifice e, which assumes one of three positions-first, that in which it is transversely of the throughway-passage f, so that the gassupply is cut-off; second, when it is in line with the throughway f, so that the gas is full on, and, third, when turned beyond the fullon position, so that it is open both to the throughway f and to a by-pass orifice h, leading to a pilot-lighting tubej, one or both ends of the orifice e in the plug b being en= larged for this purpose; The pilot-lighting tubej is formed witha number of jet-orifices 7e, up which theflame travels or climbs when the gas issuing fromthe lowest jet or orifice is ignited by an electric spark, the ignitingspark being produced between a spring-wire m on an insulated terminal Z of an electricbattery circuit secured on or alongside the by-pass tube and a like wire 'n on an arm 0 of the chain-lever c, which operates the tap I). These springs are brought into rubbing contact and pass each other, so as to produce an electric spark on the making and breaking of the circuit.

In the operation of the device when the burner is to be lighted the chain (1 is pulled, so as to turn the tap b from the off position to and beyond the full-on position, whereby the by-pass and burner are both opened to the gas-supply and the spring-wires make and break contact, so that an electric spark is produced which ignites the lowest of the gasjets of the climbing bypass, the jets It being lighted one from the other until the uppermost jet impinges on the incandescent mantle. The usual stops limit the extent of motion of this tap. Around the end of the tap b is coiled a spring q, the free end of which is'brought to bear on a stop-pin r, so placed that when the pull on the chain d is relieved the spring q turns back the tap b to the fullon position, in which it cuts off the bypass after the burner has been lighted instead of the by-pass jet or jets being allowed to burn. The size of the by-pass jets k may be regulated by a screw 5 entering the by-pass tube j, and the jet-orifices may be carried spirally around the tube, so that the'ignition-jet for the burner maybe at right angles to that ignited by the electric spark.

For applying the-electric current one pole of the battery may be attached to the gas- .main at any convenient point and an insulated wire run with abranch to each light, or for lighting street-lamps the battery may be carried by the lamplighter and the contact made through the lighting-pole.

Having now described the invention, what we claim, and desire to secure by Letters Patent, isl In a lighting device for incandescentgasburners, the combination with a burner-supply pipe of a by-pass, a tap having orifices adapted to open the supply-pipe to the burner and on further turning to the by-pass also,- a cross-lever operating said tap, a pull at either end of said lever, a spring acting on said lever to turn the tap to full-on position, a wire spring at one end of said lever, a pilot-lighting tube connected with the by-pass and having a helical row of jet-orifices, means for regulating the admission of gas to the tube, a wire spring in electrical circuit fixed near the pilot-tube and adapted to make and break contact with the spring at the end of the lever and by means of a spark to ignite a jet in the lowest orifice of the pilot-tube when the tap is turned against spring-pressure to be open to the by-pass as Well as the burner, 10

substantially as described.

In witness whereof we have hereunto set our hands in presence of two witnesses.

JAMES KEITH.

GEORGE KEITH. 'Witnesses:

WALLACE CRANSTON FAIRWEATHER, JNO. ARMSTRONG, Jr. 

